Michelle Obama has unveiled a new campaign focusing on the tens of millions of girls around the world who lack access to any kind of education, asking audience members at the 2015 Global Citizen Festival to tweet photos of themselves with the hashtag #62MillionGirls.

"Right now, 62 million girls are not in school," the first lady told the audience. "And what's important to know is that these are our girls. They deserve the same chances to get an education as my daughters and your daughters and all of our children."

In school, I learned how to speak up for myself. #62MillionGirls don't have that chance. http://62MillionGirls.com -mo pic.twitter.com/lVVkv7vcDD

"And make no mistake about it, giving them that chance is at the core of our work to end global poverty. It's the only way to ensure that these girls can fulfill their potential, provide for their families and contribute fully to their countries," she continued. "... I want you to tweet or Instagram a photo of yourself using the hashtag #62MillionGirls, and I want you to answer this one question: What did I learn in school?"

Celebrities, politicians and other Twitter users were quick to jump on the hashtag.

In school I learned to pretend I read Moby Dick. #62milliongirls don't have that chance. http://62milliongirls.com pic.twitter.com/IcCOS1CDWY

I'm grateful for the teachers who helped spark my sense of curiosity. The #62MillionGirls who aren't in school should have that same chance.

In school I was given a gift. Now I give that gift to kids in Padhar, India. Let's give that gift to #62milliongirls. pic.twitter.com/Jy0hvsIlwi

In school, I learned being partially deaf meant you work harder to win. #62MillionGirls don't have that chance." pic.twitter.com/OPzrivYU8E

In school I learned the importance of creative arts. Now I'm an artist #62MillionGirls don't have that chance @FLOTUS pic.twitter.com/i5JrZj8Fwo

In school, we learned about engineering, teamwork, and leadership. #62milliongirls don't have that chance. #omgrobots pic.twitter.com/4KWirqn2H8

In school I learned anything is possible if you work for it. #62milliongirls don't have that chance. pic.twitter.com/n0Q6xTSF7U

In school I learned individuals must make the change they seek. #62MillionGirls shld have chance to draw own lessons pic.twitter.com/7l1zmzJBpr

Other speakers included Vice President Joe Biden, educational rights activist Malala Yousafzai, actors Hugh Jackman and Leonardo DiCaprio, musicians Beyoncé and Bono as well as the band Pearl Jam.

"I want education to be the top priority because how can we end poverty ... when we deny the right to education," Yousafzai told the audience, according to Yahoo News. "It's not that there is lack of money in this world ... we have billions and trillions of dollars, but where the money goes is military, it's things that are useless and that are not useful to society."

"It is a book and a pen that can change the life of a child — it's not a gun," she continued. "It was a gun that hit me on the left side of my forehead, it was a gun that hit my two friends, but it wasn't a pen. But it was a pen (that) really helped us go forward in our lives."